AVODAPTER VALVE TESTER ADAPTERS, 1932

The units are plugged into a receiver between the valve under test, the set is switched on and after a warm up period with the leads connected to a test meter the performance of the valve can be measured.
The four and five pin unit in 1923 cost 25 Shillings and the seven pin unit cost twelve shillings and six pence.

Bruce Hammond Collection

A1263